Carburetor



Feb. 17,1941; P. A., MEYER 2 Sheets-Sheet l Filed Deo. 19, 1944 as l zal2e FIG,

INVENTOR, ,DETER A. E.

MEYER.

Y. Mw .T

Feb. 17,' 1948. P. A. R. MEYER CARBURETOR Filed Dec. 19, 1944 2Sheets-Sheet 2 FIG. 3

INVENTOR,

PETER ARMS/ER WM/L7 ATTORNEX Patented Feb. I7, 1948 unir En stareseArsNr oFF-ice casema cimncnnrois Pieter-:1a.y Ibi-Meyer;Collegei-Bointg-.N Y.. xppuoationfnemer 19, 1944 sriarna: 5681822.

comme. (encuadrar This invention: relates to carburtcrs'i. andi tocorrelated invetibfrsi and discoveries? appertaiiie ing! thetbimorecompletely their is; acnievedi by existingv crearte-referia A@mbraispecicf o jectotr the; invention ie the provision or te obtain. a;nrie mixture wniolr i'saconiparativeiy free? fronrA wet; gasoline;infor'der to redacta motdrvibzation.

A- further' object of the lavender-i1 is: theD provi,- sionr of acarburetor' which1` i`s` simplefin constituction andcertain in operationand oriej wherein ity is' possibley to the most economical. mix turewith thei requi-red performances.

A-lnotleilof the' more s'llecinc objectsE of' the inver-leonie theprovision or mesme for.y supplying gasoline to thel carburetor" whichwill-` function.. regardless of' thei positiorr-r or the carburetor' en'motor, so as: to assur-e2 directive; motor narrow-f ance`v in: an#airplane-for example:-

other' objects:- ot invention win be obviousiipor'ian' nderstandi'iig'o'f the illustrative em# bodiment about-to beclesciibe'd,` onwillbefindiicated"` in# ther appended claims; and? various ad vantagesnotreferred tohereinl occur to one' skilled? in* the art uponempioymentof inH venti'on il'npractice;

Itj isy to* be understood that the inverationy corre templatescarburetor having@A iiiiprovedf arrangement" o f fel passages' arid/orturbiilatiiig! means whereas" the drawings illustrate cer-'taint ofthe-more-spec'c aspects thereof. A

The preferred' embodiment-of the' carburetor which has been chosen forpurposes off diestra tion anderes-enorme, forming ai partoftriespewncatio v'and 'rr whichthe samejreference char-F aciersvr dfigate the sani-e or' like parts; is" dis;

closed i the accompanying drawings', wherein: Fig.. is' a. sectionalview taken vertically Fig. 4 comprises two views the throttle" discsinrplam with a. portioni ofV one shaitvin section;l

Fig.v 5 is ai fragmentary' sectional View' onv the Enola-wget eYcarburetor. and. reveals' the tirrotties Fig. 61 isl an isometricIsectionali viewtaken ver. tlca-ll'y through the carburetor;l

Figa "Fiss affrontil elevation oi the carburetor' in: conjunction-witha1 delayed motionmeclianisrlr-v for tlrottling'.`- and'acoeleraton.

Intlieexempliiied' carburetor there is provided; a-carburet'orbbdyf If,which-mayfbeformed of-'casii iron; lor-'assor1 otlier suitablematerial.. Securely` attache@ within the carburetor' body are'.th-evven' turiltiibes arret` 3, proferabiy of cast aluminum` andconsisting o'iupperi members. 4F and 61 andi' se'rves`to*increase'ftheevaporation area; In'. actual practice the iiuid: willforni a: thin film which is ezrposed-A to? the periphery of the aircurrent. This greatly increases the' absorption area and. assuresbetter." vaporization`` Evaporation. will. thusr take place more?readily tlfia-nv with the conventional` soliolk jet and needle valvecontrol. It willi be readily seenl that gasoline spread over a: wide.surface will evaporate in ay fraction of the time taken.. by afselioidrop# on asingle point. A solid drop of gasoline: mustr nrst be brokeninto.v nparticles., atomized and? then be converted into' vapor beforeit becomes an explosive gas:

additional feature is incorporated in the lower Venturi .members 5 and.1 and comprises. tubular:y ducts lf2 and' |-3 formed by spacing theruiter carburetor body. t from the lowerl Venturi4 members. Directlybelow the Venturi members;

andv securely mountedwithin the carburetor body are. beveled corni-cerings i5 and i6. These rings, poveierablyk of metal, are especiallyadapted to vaporize from their upper surfaces unvaporzedvcasali-rie'desiringy down the. tubes i2 or t3- or down the innersurfaces@ of the members, 5- anct l. When there is a strong air flowpractically all thel gasoline will -flow thru 8 or 9, and little,y itany; thm t2 and i3, but. when the flow is weak, gasoline which wouldotherwise not be vaporized, will now to the cornice. ring and. bevaporized, theres,

The butterfly throttle valves I1 and I8 are especially adapted toturbulate the owing air stream and to vaporize any gasoline which isstill in a wet condition as it comes from the venturi. These valvescomprise plates I9 and 2U one side of which is bent as shown at 2| and22 or otherwise constructed to move as the valves are rotated by theirshafts 25 and 26, at a slight distance from the curved surface of thecarburetor body wall indicated at 21 and 2l' of Fig. 1. The spacebetween the gradually opening throttle discs and the carburetor bodywall is utilized to create additional turbulence of the gas flow andfuel reaching this stage of the carburetor.

In addition, the throttle valves carry lspecialV deector members 28 and29 consisting of relatively thin semi-circular sheets of metal rivetedto the throttle discs at 23 and 2li. flectors form pockets having inletorifices which serve to catch the air stream and causeitto flow throughnarrow vents at 35 and 35 when the throttles have reached their openposition as illustrated in Fig. 2. VThis creates additional turbulencefor providing a fine mixture and serves to vaporize wet gasolinereaching or condensing on the interior of the shafts. An adjustableopening 25' controlled by a threaded pin or screw il isr formed throughthe shaftii and likewise on shaft 25 to enable air to pass through thethrottle valve when closed to idle position. Y

The base of the carburetor is provided with a conventional flange 38drilled as indicated at 3'! and 39 for attachment to an intake manifold.

.Fuel is delivered to the fuel chamber illustrated in Fig. 3 through anipple d3` mounted through an opening formed in the end wall oi therecess 42 and has its center portion threaded for connecting with a feedtube or pipe leading from a source of supply. The inner portion of thenipple forms a valve housing l having a valve seat formed therein forengagement by a needle valve lill. This needle valve extends from thevalve housing and is engaged by an abutment plate 43B' extendingupwardly from the hinge strip 45 of the cork iioat d8. The hinge stripis pivoted around a hinge pin 3 mounted transversely through the recessand upon movement of the float upwardly the abutment plate forces theneedle valve through the valve housing l thereby. seating into the valveseat and closing the iiovl of fuel into the chamber. In consequence, anappropriate level of gasoline will be maintained ln the fuel chamber atall times. v

rFhe fuel chamber may also be used iloatle'ss. Gasoline is pumped in oneorifice from a conventional fuel pump and unused gasoline is returnedfrom opposite orice back to the fuel tank. The gasoline is supplied `tothe venturi through the metering jets Hl and H. Gasoline is maintained'to a level above the two metering jets thereby supplying the carburetorregardless of its position. I f I An additional feature illustrated byFig. 7 comprises a mechanism for delaying the opening ofthe secondthrottle valve on shaft 25 at a predetermined interval after the initialopening of the throttle valve on shaft 25. The throttle lever 52 ismounted on shaft 25 and locked in position by set screw Eil. Securelymounted on shaft 25 is the collar 5@ having aK contact pin 5l projectingfrom its face for engagement by throttle lever 52. Attached to thecircumference of collar 5t by set screw SB is a flexible ribbon 59 ofwire mesh or other suitable material. This ribbonVis-par- These deitlally carried around the collar and traverses to collar 58 on shaft 26where it is rigidly fastened by set screw 6I. A set screw 55 is used forfastening collar 53 on its shaft. A spring 62 held by fastening screw E3maintains a steady tension. This tension is for the express purpose ofholding the right hand throttle on shaft 26 normally in closed positionuntil its collar is caused to revolve in a clockwise direction by theflexible ribbon. .Such movement will not take place until the throttlelever arm V52 has traversed suiliciently to reach the advanced positionas indicated by dotted lines 53 thereby engaging contact pin 5l andcausing collar 56 to turn in an anti-clockwise direction. Theoutstanding advantage of this feature is its provision of a secondsupply of power and added acceleration when required.

Sometimes'a motor does not develop sufficient vacuum during the initialstarting period to supply both venturis properly. This can be overcomeby delaying the opening of the second throttle valve as above described.

It will be appreciated that the invention in various of its aspects isadapted for use in carburetors having air passageways of a variety ofcross-sectional congurations; and that while a divided air-nowcarburetor is exemplified various of the aspects of the invention may bereadily incorporated ina single tube device, and other variations may bemade without departing from the spirit and scope of the invention, theextent ofwhich is indicated by the appended claims.

Having thus described the invention, what is claimed is:

1,. In a downdraft carburetor, a carburetor body member having a partfor direct association with an internal combustion engine, dual,ksubstantially cylindrical upper and lower Venturi elements spaced toform annular crevices for dis-v persing gasoline within said Venturimembers, said lower Venturi elements having their upper wall surfaceserrated for increased gasoline dis persal, andan orifice discharginginto a narrow duct extending lengthwise through said lower Venturiwalls, metallic rings securely attached adjacentto the internal wall ofsaid carburetor body directly beneath said lower Venturi members andcaused to receive gasoline through said ducts from said annularcrevices, a source of suction for producing dual air currents throughsaid Venturi. members, two substantially circular throttle discs forcontrolling said air currents, said throttle discs having a narrowsegment and a relatively wide segment angularlydisposed to each otherand securely attached to a shaft rotatably mounted in said carburetorybodyy wall, curved deflector plates rigidly fastened to but spaced fromthe undersurface of said throttle discs forming a curved trough forproducing turbulence, and the lower extremity of said carburetor bodymember inwardly-` curved to produce, in cooperation with said throttlediscs, additional turbulence of the airV flow. l l

2. A carburetor comprising a body member having a passagewaytherethrough a venturi in said passageway, said venturi having anannular fuel feeding crevice surrounding said passageway, a fuel inletin said body member communicating with Vsaid annular crevice, arotatable throttle disk in said passageway, a shaft therefor, andturbulating meansV in said passageway, said meansV including a deflectorsegment carried by said throttle disk and forming a V-shaped'pccket,said pocket having an inlet orifice movable to and from the direction ofair oWin-said venturi and a discharge vent pointed towards said throttleshaft whereby air-fuel mixture entering said inlet orice will strikesaid shaft and form an eddy current as the mixture discharges from saidV-shaped pocket.

3. A carburetor comprising a body member having a passagewaytherethrough, a venturi in said passageway, said venturi having anannular fuel feeding crevice surrounding said passageway, a fuel inletin said body member communieating with said annular crevice, a cornicering for feeding fuel in said passageway and positioned subjacent tosaid venturi, said cornice ring spaced from said venturi and forming alateral passageway for fuel therebetween, a channel within said bodymember exterior of and surrounding said venturi, said channelcommunieating from said fuel feeding crevice to said lateral passagewaywhereby fuel may be conducted from said annular crevice to said cornicering.

4. A carburetor comprising a body member having a passagewaytherethrough, a venturi in said passageway, said venturi having anannular fuel feeding crevice surrounding said passageway, said annularfuel feeding crevice on said venturi having its lowermost surfaceradially serrated to increase its fuel feeding area, a fuel inlet insaid body member communicating with ing an edge portion at one side ofthe shaft bent upwardly, turbulating means including a deflector segmentcarried by said throttle disk and forming a V-shaped pocket thereon,said pocket having an inlet orifice movable to and from the direction ofair flow in said venturi as the throttle disk is rotated with said shaftand a discharge vent pointed towards said throttle shaft wherebyair-fuel mixture entering said inlet orifice will strike said shaft andform an eddy current as the mixture discharges from said V-shapedpocket, and the entire lower extremity of said body member converginginwardly in a substantially semi-spherical conformation and forming, incooperation with said throttle disk, additional turbulation of saidair-fuel mixture.

6. A carburetor comprising a body member having dual passagewaystherethrough, a venturi in each passageway, said venturis having annularfuel feeding crevices surrounding said passageways, a fuel inlet in saidbody member said annular crevice, a rotatable throttle disk *I in saidpassageway, a shaft therefor, and turbulating means in said passageway,said means including a deilector segment positioned in a plane parallelto the axis of rotation of said throttle disk and forming a V-shapedpocket thereon, said pocket having an inlet orifice movable to and fromthe direction of air flow in said venturi as the throttle disk isrotated with said shaft and a discharge orifice pointed towards saidthrottle shaft whereby air-fuel mixture entering said inlet vent willstrike said shaft and form an eddy current as the mixture dischargesfrom said V-shaped pocket.

5. A carburetor comprising a body member having a passagewaytherethrough, a venturi in said passageway, said venturi having anannular fuel feeding crevice surrounding said passageway, said annularfuel feeding crevice on said venturi having its lowermost surfaceradially serrated to increase its fuel feeding area, a fuel inlet insaid body member communicating with said annular crevice, a cornice ringfor fuel feeding subjacent to said venturi, said cornice ring spacedfrom said venturi and forming a lateral passageway for fueltherebetween, a channel exterior of said venturi communicating from saidfuel feeding crevice to said lateral passageway whereby fuel may beconducted from said crevice to said cornice ring, a rotatable throttledisk in the passageway subjacent to said cornice ring, a shaft therefor,said rotatable throttle disk havcommunicating with said annularcrevices, a rotatable throttle disk in each passageway, individualthrottle shafts therefor, and means to delay the opening of one of sai-dthrottle disks a predetermined interval after the other, said meansincluding an arm xedly secured to one of said shafts, a collar looselyheld on the aforesaid shaft, a collar fixedly held on the other of saidshafts, a reverse wound flexible ribbon connecting said collars, springmeans on said xedly held collar for yieldingly resisting openingmovement of said collar, a lug on said loosely held collar and spaced apredetermined distance from said xed arm when said arm is in a closedposition, said lug permitting the shaft thereof to be rotated saidpredetermined distance before said arm actuates the other rotatableshaft.

PETER A. R. MEYER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS I Great Britain June 28, 1939

